It is unclear as to how you entered the constraint. Here are some
common issues:

1.) Pick an edge (either rising or falling) to measure the delay.

2.) Is a+.1 the max and a the min? If so, look at the values reported in
the spread sheet and just use a hard number. For example if the delay to
load1 is the longest and is reported as .9 ns, use that as the max and .8 as
the min.

3.) Check the time resolution for the nets of interest. (it is in
Edit>Rules>Rule Classes>Checking ) The default is 50 ps - change it to 20
ps for the nets you want balanced.

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